参数资料
型号: SI4421-A0-FT
厂商: Silicon Laboratories Inc
文件页数: 35/45页
文件大小: 0K
描述: IC TXRX FSK 915MHZ 3.8V 16-TSSOP
标准包装: 96
频率: 433MHz,868MHz,915MHz
数据传输率 - 最大: 256kbps
调制或协议: FSK
应用: ISM
功率 - 输出: 7dbm
灵敏度: -110dBm
电源电压: 2.2 V ~ 3.8 V
电流 - 接收: 15mA
电流 - 传输: 28mA
数据接口: PCB,表面贴装
天线连接器: PCB,表面贴装
工作温度: -40°C ~ 85°C
封装/外壳: 16-TSSOP(0.173",4.40mm 宽)
包装: 管件
产品目录页面: 585 (CN2011-ZH PDF)
其它名称: 336-1737-5
Si4421
Sensitive Reset Enabled, Ripple on V dd :
V dd
Reset threshold voltage
(600mV)
Reset ramp line
(100mV/ms)
1.6V
time
nRes
output
H
L
Sensitive reset disabled:
V dd
Reset threshold voltage
(600mV)
Reset ramp line
(100mV/ms)
250mV
time
nRes
output
H
L
Software reset
Software reset can be issued by sending the appropriate control command (described at the end of the section) to the chip. The
result of the command is the same as if power-on reset was occurred but the length of the reset event is much less, 0.25ms typical.
The software reset works only when the sensitive reset mode is selected.
V dd line filtering
During the reset event (caused by power-on, fast positive spike on the supply line or software reset command), it is very important to
keep the V dd line as smooth as possible. Noise or periodic disturbing signal superimposed the supply voltage may prevent the part
getting out from reset state. To avoid this phenomenon use adequate filtering on the power supply line to keep the level of the
disturbing signal below 100mV p-p in the DC – 50kHz range for 200ms from V dd ramp start.. Typical example when a switch-mode
regulator is used to supply the radio, switching noise may be present on the V dd line. Follow the manufacturer’s recommendations
how to decrease the ripple of the regulator IC and/or how to shift the switching frequency.
Related control commands
FIFO and Reset Mode Command (page 20)
Setting bit<0> to high will change the reset mode to normal from the default sensitive.
SW Reset Command
Issuing FE00h command will trigger software reset (sensitive reset mode must be enabled). See the Wake-up Timer
Command (page 25).
35
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